package com.tin.tinpicturebackend.service.impl;

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.tin.tinpicturebackend.constant.UserConstant;
import com.tin.tinpicturebackend.exception.BusinessException;
import com.tin.tinpicturebackend.exception.ErrorCode;
import com.tin.tinpicturebackend.exception.ThrowUtils;
import com.tin.tinpicturebackend.model.dto.user.UserQueryRequest;
import com.tin.tinpicturebackend.model.entity.User;
import com.tin.tinpicturebackend.model.enums.UserRoleEnum;
import com.tin.tinpicturebackend.model.vo.LoginUserVO;
import com.tin.tinpicturebackend.model.vo.UserVO;
import com.tin.tinpicturebackend.service.UserService;
import com.tin.tinpicturebackend.mapper.UserMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;


/**
 * @author a1
 * @description 针对表【user( 用户 )】的数据库操作Service实现
 * @createDate 2025-10-30 21:03:00
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
        implements UserService {

    private static final String AVATAR_URL = "http://117.72.158.70:9090/api/v1/buckets/shangpingzhengxuan/objects/download?preview=true&prefix=avatar.jpg&version_id=null";

    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {

        // 1、校验参数
        if (StrUtil.hasBlank(userAccount, userPassword, checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入的密码不一致");
        }

        // 2、检查用户账号是否在数据库中已存在
        LambdaQueryWrapper<User> userLambdaQueryWrapper = new LambdaQueryWrapper<>();
        userLambdaQueryWrapper.eq(User::getUserAccount, userAccount);
        Long count = this.baseMapper.selectCount(userLambdaQueryWrapper);
        if (count > 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号已存在");
        }

        // 3、密码一定要加密，撒盐
        String encryptPassword = getEncryptPassword(userPassword);
        // 4、插入数据到数据库中
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("李小梨");
        user.setUserAvatar(AVATAR_URL);
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean save = this.save(user);
        if (!save) {
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败，数据库错误");
        }
        return user.getId();
    }

    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        // 1、校验参数
        if (StrUtil.hasBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        ThrowUtils.throwIf(userPassword.length() < 8, ErrorCode.PARAMS_ERROR, "用户密码过短");
        ThrowUtils.throwIf(userAccount.length() > 20, ErrorCode.PARAMS_ERROR, "用户账号过长");

        // 2、加密密码
        String encryptPassword = getEncryptPassword(userPassword);

        // 3、查询用户
        LambdaQueryWrapper<User> userLambdaQueryWrapper = new LambdaQueryWrapper<>();
        userLambdaQueryWrapper.eq(User::getUserAccount, userAccount).eq(User::getUserPassword, encryptPassword);
        User user = this.baseMapper.selectOne(userLambdaQueryWrapper);

        // 不存在抛异常
        if (user == null) {
            log.info("user login failed, userAccount cannot match userPassword");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或密码错误");
        }

        // 4、返回用户信息
        request.getSession().setAttribute(UserConstant.USER_LOGIN_STATE, user);
        return this.getLoginUserVO(user);
    }

    @Override
    public User getLoginUser(HttpServletRequest request) {
        // 是否登陆
        Object Objuser = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        User user = (User) Objuser;
        if (user == null || user.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        // 从数据库中查询（追求性能的化可以注释，直接返回上述结果）
        Long id = user.getId();
        user = this.getById(id);
        if (user == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return user;
    }

    @Override
    public boolean userLogout(HttpServletRequest request) {
        // 是否登陆
        Object Objuser = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        if (Objuser == null) {
            throw new BusinessException(ErrorCode.OPERATION_ERROR, "未登录");
        }
        // 移除登录态
        request.getSession().removeAttribute(UserConstant.USER_LOGIN_STATE);
        return true;
    }

    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        QueryWrapper<User> userQueryWrapper = new QueryWrapper<>();
        userQueryWrapper.eq(ObjUtil.isNotNull(id), "id", id);
        userQueryWrapper.like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount);
        userQueryWrapper.like(StrUtil.isNotBlank(userName), "userName", userName);
        userQueryWrapper.like(StrUtil.isNotBlank(userProfile), "userProfile", userProfile);
        userQueryWrapper.eq(StrUtil.isNotBlank(userRole), "userRole", userRole);
        userQueryWrapper.orderBy(StrUtil.isNotBlank(sortField), sortOrder.equals("ascend"), sortField);
        return userQueryWrapper;
    }



    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user == null) {
            return null;
        }
        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtils.copyProperties(user, loginUserVO);
        return loginUserVO;
    }

    @Override
    public UserVO getUserVO(User user) {
        if (user == null) {
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtils.copyProperties(user, userVO);
        return userVO;
    }

    @Override
    public List<UserVO> getUserVOList(List<User> userList) {
        if (CollUtil.isEmpty(userList)) {
            return new ArrayList<>();
        }
        return userList.stream()
                .map(this::getUserVO)
                .collect(Collectors.toList());
    }

    /**
     * 获取加密后的密码
     *
     * @param userPassword
     * @return
     */
    @Override
    public String getEncryptPassword(String userPassword) {

        // 加盐
        final String SALT = "ting";
        return DigestUtils.md5DigestAsHex((userPassword + SALT).getBytes());
    }

    @Override
    public boolean isAdmin(User user) {
        return user != null && user.getUserRole().equals(UserRoleEnum.ADMIN.getValue());
    }


}




